bump to version 0.0.14

This bumps the version to 0.0.14 as well as changes the version constants:

`LitaGithub::MAJ` => `LitaGithub::MAJOR_VERSION`
`LitaGithub::MIN` => `LitaGithub::MINOR_VERSION`
`LitaGithub::REV` => `LitaGithub::REVISION`